Outermost (7)
I believe the answer is:
extreme
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">outermost</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for extreme that I've seen before include "Most violent" , "Going to great lengths" , "end" , "Most remote or utmost" , "Going beyond moderation" .)